CN1187192C

CN1187192C - Screen printing apparatus and screen printing method

Info

Publication number: CN1187192C
Application number: CNB971948852A
Authority: CN
Inventors: 高桥贤; 佐藤章二; 大西浩昭; 光城浩二; 内藤孝夫
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 1996-05-28
Filing date: 1997-05-26
Publication date: 2005-02-02
Anticipated expiration: 2017-05-26
Also published as: DE69707878D1; US6105495A; EP0908311A1; JPH09314798A; DE69707878T2; EP0908311B1; JP3344895B2; CN1219906A; EP0908311A4; CN1626342A; WO1997045264A1; CN1330482C

Abstract

In a screen printing apparatus and a screen printing method, in which a printing paste on a screen is squeezed by a squeegee which is moved horizontally for printing and coating on a substrate. Thus an air cylinder (27), which is rotatable about the central position in a lenghtwise direction of squeegees (26a, 26b) and cancels a weight of the squeegees (26a, 26b), lifts the squeegees (26a, 26b), and then air cylinders (35, 36) disposed at symmetrical positions relative to the central position push down the squeegees (26a, 26b) to squeeze an upper surface of a screen (23). The squeegee is flexibly moved along the substrate, irrespective of inclination, waviness and warp of the substrate, to evenly perform printing under low, constant printing pressure to provide a highly accurate printing of good configuration.

Description

Screen press and screen plate printing method

Technical field

The web plate that the present invention relates to by forming printing template open pore forms the electronic component circuit that the printing offset printing brush of soldering paste etc. is coated on printed substrate etc. with screen press and screen plate printing method on substrate and so on.

Technical background

In recent years, screen press and screen plate printing method are used to the soldering paste printing process in the circuit installation procedure of electronic component, but miniaturization, lightweight, multifunction along with electronic equipment, miniaturization, the high precision int of electronic component installation base plate also develop, to this, requirement high accuracy printing, wherein, contact print and control get edition speed (version is driven from れ speed system) printing also with becoming main flow.

So-called contact print, be that to make gap between web plate and the substrate be zero to print, be suppressed to the printing that Min. is a purpose with the distortion of the web plate that will be produced by the gap, and an edition speed printing is got in control, be for print dimensionally stableization, when making substrate leave web plate with by by the viscosity of the soldering paste that is filled in the web plate open pore, adhesion tractive web plate and to be suppressed to Min. be purpose and will get the printing that edition speed is controlled to be low speed (being generally 1mm/sec in recent years) to the distortion of printing shape.In recent years, low coining printing is used more and morely, and various methods have been imagined, its purpose is, will be that necessary bigger coining (pressing force when squeegee is pushed web plate) be produced because of surpassing, soldering paste is suppressed at Min. towards the bad refluence at the web plate back side and the bad off normal that produces because of squeegee tractive web plate when printing.

As an example of low coining printing, the screen press that a kind of as Japanese patent of invention open nineteen ninety-five is arranged No. 205397 communique is put down in writing.

Below, come in conjunction with the accompanying drawings summary description in existing screen press and screen plate printing method in conjunction with introducing a relevant example that hangs down the coining printing technology.

Fig. 9 is that expression is used for the schematic front view of low coining printing head in the general existing screen press of summary description and the screen plate printing method, and the low coining of expression prints in the head part of pneumatics loop diagram roughly.

In Fig. 9, the 1st, squeegee, the 2nd, be used for clamping, keep the squeegee retainer of squeegee 1, the 3rd, be used for keeping the retainer of squeegee retainer 2, the 4th, lifting drives the double rod type cylinder of squeegee 1, the 5th, the lifting guide way when lifting drives squeegee 1, the 6th, the sliding support of lifting guide way 5 usefulness, the 7th, the upside piston rod of cylinder 4, the 8th, the block of adjustment cylinder 4 lifting travels, the 9th, the downside piston rod of cylinder 4, the 10th, be fixed on the base on downside piston rod 9 tops, the 11st, be fixed on the swivel bearing axle on the base 10.

Retainer 3 is fulcrum with swivel bearing with axle 11, and rotary oscillation is entrenched on the base 10 freely.

The 12nd, the overhang adjustment that makes the top is freely so that the micrometer head of top and retainer butt, and it is fixed on the base 10.The 13rd, spring is installed between base 10 and the retainer 3, and micrometer head 12 is that center be in roughly symmetric position with swivel bearing with axle 11 with spring 13.The 14th, the clamping shift fork that the rotary oscillation of retainer 3 is fixed.

The 15th, manually adjust and use adjuster, when squeegee 1 is risen, will deliver to the bottom air scoop 16 of cylinder 4 with the air pressure of adjuster 15 by manual adjustment.The air pressure of this moment must be in advance adjusted by the people with manually adjusting with adjuster 15, the deadweight that becomes the appropriate authority part class that comprises squeegee 1 and move with squeegee 1 interlock partly and during lifting resistance in interior air pressure.

The 17th, electropneumatic controller, when squeegee 1 is descended, the air pressure that comprises the minimal power that the squeegee 1 after rising with the air pressure of being adjusted with adjuster 15 by manual adjustment is pressed down and be used for pushing down web plate 18 add together always push air pressure, deliver to the upper air mouth 19 of cylinder 4 by electropneumatic controller 17.

With respect to the parallel adjustment of the squeegee 1 of web plate 18, adopt micrometer head 12 and by visual carrying out.

Utilize structure like this, just can print with squeegee 1 and the power of the deadweight part of the appropriate authority part class of action has been eliminated the low coining behind the pressing force of web plate 18 with squeegee 1 interlock pressing force for web plate 18 and substrate 20.

But, in structure as described above, mainly contain 5 problems of following announcement, and can not adapt to further when improving setting printing condition operation, setting accuracy and repeatability, seek to realize the requirement of high accuracy printing.

Problem 1

Owing to be the structure that makes the supporting part butt of micrometer head 12 and squeegee 1, so not flexibly along the inclination of substrate 20 in directions such as print direction and vertical direction thereof, rise and fall with crooked, cause that coining is unbalanced, the poor shortcoming of printing precision (printing shape, printing volume etc.) thereby have.

Problem 2

Because the error of squeegee 1 on making, the center of gravity of the middle position of squeegee 1 and squeegee 1 produces dislocation, and squeegee 1 be middle mind-set either party's inclination with swivel bearing with axle 11, so be that the center exists coining shortcoming inequality with swivel bearing with spools 11.

Problem 3

In the production scene, because general length and the corresponding squeegee 1 of substrate size of using, and conduct oneself with dignity and change along with the length of squeegee 1, material, so, according to these situations, must adjust with the air pressure of adjuster 15 manual adjustment at every turn.In addition, to change the air pressure of electropneumatic controller 17 equally, so that total pressing force is adjusted again.

Moreover, because the deadweight of squeegee is uncertain, thus must according to estimate or with other tester institute instrumentation to the result adjust.Therefore, expend the unnecessary working time, and operation, setting accuracy are poor, lack repeatability.

In addition, for relax these shortcomings as far as possible, also can be by setting the maximum deadweight that squeegee 1 can be installed, adjust the air pressure of manually adjusting with adjuster 15 in advance, eliminate manual adjustment and adjust operation, find out the unnecessary job step that pressure is eliminated in deadweight but still exist with thinking work with the air pressure of adjuster 15.

Problem 4

Because with respect to the parallel adjustment of the squeegee 1 of web plate 18, with micrometer head 12 and by visual the adjustment, so exist because of the error of operator's generation, the shortcoming that the setting accuracy difference lacks repeatability.

In addition, as an example (not shown) different with existing example, also have a kind of cancel micrometer head 12 with spring 13, make rotation structure freely, though compare with lock-out state, can save the time of parallel adjustment operation, but also have the printing template to be in the excentral situation of web plate 18, at this moment with respect to the center of web plate 18, for doing the stability of keeping parallelism state better, it is maximum prerequisite that the center of the length direction of squeegee 1 is roughly made consistent with the center of substrate 20.

Problem 5

Even because when making substrate 20 leave web plate 18, also the one side push web plate 18 ground with squeegee 1 be pressed into the one side print, so exist, and make the printing warpage, make the shortcoming of printing precision variation because of web plate 18 bendings (producing) owing to till the end of the descending stroke of cylinder 4, be pressed into web plate 18.

The present invention is exactly to be purpose with the shortcoming 1～5 that solves above-mentioned announcement.

Purpose 1

Make inclination, fluctuating, the case of bending of squeegee and substrate have nothing to do and flexibly balancedly print with low constant coining along web plate.

Purpose 2

Irrelevant and do not have inclination, balance and well and balancedly print with the position of centre of gravity of squeegee with constant coining.

Purpose 3

For the soldering paste that will produce because of the deadweight low coining printing partly of eliminating squeegee is suppressed to Min. towards the bad refluence at the web plate back side, the bad off normal that is produced because of squeegee tractive web plate when printing etc., and make deadweight along with the length of squeegee, material and change, so find out the unnecessary job step of deadweight elimination pressure with thinking work by cancellation, and operation, setting accuracy and repeatability when improving setting printing condition.

Purpose 4

By eliminating parallel adjustment operation that carry out with skilled thinking work, the relative web plate of squeegee, carry out the operation when improving setting printing condition, setting accuracy and repeatability with controlling automatically.

Purpose 5

The web plate case of bending that is produced when substrate being left the getting edition of web plate is suppressed to Min. and realizes good product printing.

Disclosure of an invention

For solving above-mentioned shortcoming, screen press of the present invention has: the web plate that forms printing template open pore; With the assigned positions such as center of length direction is that pivot is made the squeegee freely, that contact freely and can be pressed into described web plate of rotary oscillation up and down; And the horizontally moving device that described squeegee is moved along general horizontal direction relative to described web plate, make described squeegee contact and be pressed into described web plate, move horizontally and the open pore by described web plate is coated on the brush of the printing offset printing on the described web plate in the screen press on the substrate, also has constant voltage float-type control device, when it prints coating and printing glue on described web plate, from applying power to ascent direction and make state after squeegee rises for eliminating described squeegee deadweight, to be applied to described squeegee to the power that descent direction presses down by the position that becomes both sides from described pivot along its length makes described squeegee contact and be pressed into freely with described web plate, and, when make described squeegee relative to described web plate when general horizontal direction moves, with along described substrate with respect to the approximate horizontal moving direction of described squeegee and the inclination of length direction, states such as fluctuating and bending are made the posture of rotary oscillation and lifting, with described squeegee described web plate is pressed into to described substrate, produces constant voltage simultaneously.

In addition, for solving above-mentioned shortcoming, screen plate printing method of the present invention, be a kind of be that rotate in vertical guide freely squeegee of pivot contact with the web plate that forms printing template open pore and is pressed into, moves horizontally and the printing offset printing on the described web plate is brushed the screen plate printing method that is coated on the substrate by the open pore of described web plate by making assigned positions such as center with length direction, its characteristics are

When described squeegee being relatively moved and make printing glue be filled in the printing template open pore of described web plate along general horizontal direction,

Apply power to ascent direction squeegee is risen for eliminating the deadweight of described squeegee, from this state, to be applied to described squeegee to the power that descent direction presses down by the position that becomes both sides from described pivot along its length makes described squeegee contact and be pressed into freely with described web plate, when make described squeegee relative to described web plate when general horizontal direction moves, with along described substrate with respect to the approximate horizontal moving direction of described squeegee and the inclination of length direction, states such as fluctuating and bending are made the posture of rotary oscillation and lifting, with described squeegee described web plate is pressed into to described substrate, produce constant voltage simultaneously

After making described printing glue be filled in the printing template open pore of described web plate, before making described substrate leave web plate, described squeegee is fixed in rotary oscillation direction and lifting direction is failure to actuate, after fixing, rise to described squeegee with respect to the amount of being pressed on described web plate surface be make the top of squeegee be in the web plate surface as if just contact condition become zero position.

Adopt this structure, by eliminating the squeegee deadweight and pushing squeegee from the position of squeegee both sides, thereby can push with good, the certain low constant coining of balance web plate, its result, just can irrespectively make squeegee with inclination, fluctuating and the case of bending of substrate, and irrespectively well and balancedly print with constant coining with posture and balance that squeegee is tilted with the center of gravity of squeegee flexibly along web plate or substrate.

In addition, owing to can eliminate the low coining printing of the deadweight part of squeegee, soldering paste can be suppressed to Min. towards the bad refluence at the web plate back side and the bad off normal that produces because of squeegee tractive web plate when printing.

In addition, owing to the web plate case of bending that is produced can be suppressed to Min. when making substrate leave getting edition of web plate, so can suppress to print the distortion of shape and the deterioration of printing precision.

As top summary,, can improve operation, setting accuracy and repeatability when setting printing condition, and can realize the high accuracy printing by the structure of above-mentioned announcement.

The invention of the 1st screen press has: the web plate that forms printing template open pore; With the assigned positions such as center of its length direction is that pivot is made the squeegee freely, that contact freely and can be pressed into described web plate of rotary oscillation up and down; And the horizontally moving device that described squeegee is moved along general horizontal direction relative to described web plate,

Make described squeegee contact and be pressed into, move horizontally and the printing offset printing on the described web plate brushed in the screen press that is coated on the substrate by the open pore of described web plate with described web plate,

Also has constant voltage float-type control device, when it prints coating and printing glue on described web plate, from applying power to ascent direction and make state after squeegee rises for eliminating described squeegee deadweight, to be applied to described squeegee to the power that descent direction presses down and make described squeegee contact and be pressed into freely by become roughly the position of both sides such as antimere along its length from described pivot with described web plate, and, when make described squeegee relative to described web plate when general horizontal direction moves, with along described substrate with respect to the approximate horizontal moving direction of described squeegee and the inclination of length direction, states such as fluctuating and bending are made the posture of rotary oscillation and lifting, with described squeegee described web plate is pressed into to described substrate, produces constant voltage simultaneously.

Utilize this constant voltage float-type control device, can eliminate the deadweight of squeegee, and can be from making squeegee flexibly along web plate and irrespectively squeegee is pressed into inclination, fluctuating, the case of bending of substrate with end positions of the pivot symmetry of squeegee etc., and, owing to can irrespectively squeegee be held in the posture that do not tilt with the center of gravity of squeegee, so but balance well and balancedly push with constant coining.

The invention of the 1st screen plate printing method, be a kind of be that rotate in vertical guide freely squeegee of pivot contact and is pressed into, moves horizontally with the web plate that forms printing template open pore and the printing offset printing on the described web plate brushed the screen plate printing method that is coated on the substrate by the open pore of described web plate by making assigned position with its length direction, its characteristics are

When making described squeegee on the web plate when general horizontal direction relatively moves and make printing glue be filled in the printing template open pore of described web plate,

After making described printing glue be filled in the printing template open pore of described web plate, before making described substrate leave web plate, described squeegee is fixed in rotary oscillation direction and lifting direction is failure to actuate, after fixing, rise to described squeegee and be zero position with respect to the amount of being pressed on described web plate surface.

Adopt this method, can eliminate the deadweight of squeegee, and can be from making squeegee flexibly along web plate and irrespectively squeegee is pressed into inclination, fluctuating, the case of bending of substrate with end positions of the pivot symmetry of squeegee etc., and, owing to can irrespectively squeegee be held in the posture that do not tilt with the center of gravity of squeegee, so but balance well and balancedly push with constant coining.In addition, the web plate case of bending that is produced can be suppressed to Min. when making substrate leave getting edition of web plate.

The invention of the 2nd screen press has: the web plate that forms printing template open pore; With the assigned positions such as center of its length direction is that pivot is made the squeegee freely, that contact freely and can be pressed into described web plate of rotary oscillation up and down; And the horizontally moving device that described squeegee is moved along general horizontal direction relative to described web plate,

Make described squeegee contact and be pressed into, move horizontally and the printing offset printing on the described web plate brushed in the screen press that is coated on the substrate, also having by the open pore of described web plate with described web plate:

From applying power to ascent direction and make state after squeegee rises, will be applied to the press-in device that described squeegee makes described squeegee and described web plate contact and be pressed into to the power that descent direction presses down by the position that becomes both sides such as antimere roughly from described pivot along its length for eliminating described squeegee deadweight; And

After described squeegee being pressed into described web plate with this press-in device, make described squeegee before described web plate moves along general horizontal direction, described squeegee is held in the holding device of being failure to actuate in rotary oscillation direction and lifting direction.

Adopt described press-in device, under the state of eliminating the squeegee deadweight, can be from making squeegee flexibly along web plate and irrespectively squeegee is pressed into inclination, fluctuating, the case of bending of substrate with end positions of the pivot symmetry of squeegee etc., and, owing to can irrespectively squeegee be held in the posture that do not tilt with the center of gravity of squeegee, so but balance well and balancedly push with constant coining.In addition, adopt described holding device, can prevent from when squeegee moves horizontally, to be subjected to printing the calendering force of glue and make the squeegee knee-action, produce the unbalanced phenomenon of coining.

The invention of the 3rd screen press has: the web plate that forms printing template open pore; With the assigned positions such as center of its length direction is that pivot is made the squeegee freely, that contact freely and can be pressed into described web plate of rotary oscillation up and down; And the horizontally moving device that described squeegee is moved along general horizontal direction relative to described web plate,

Make the described relatively web plate of described squeegee liftable along the vertical direction and make the squeegee deadweight elimination power control lifting drive that force control device is eliminated in deadweight that has of its rising with the deadweight elimination power of the deadweight part of each structural element part of comprising described squeegee and moving with described squeegee;

Be located at the control of described squeegee deadweight elimination power with swivel bearing portion on the lifting drive top, support described squeegee freely at the length direction assigned position rotary oscillation of described squeegee;

Apply the power that presses down at the position of the described swivel bearing portion in the described squeegee being supported the back and becoming both sides such as antimere roughly from pivot along its length, described squeegee after being risen with lifting drive by the control of described squeegee deadweight elimination power is descended and have a pair of squeegee pressing force control lifting drive of the control device that can control automatically arbitrarily the pressing force that is applied to the described squeegee on described web plate and the described substrate;

To remain on the holding device of optional position by described squeegee pressing force control with the described squeegee location of lifting drive lifting with lowering or hoisting gear and the control of described squeegee deadweight elimination power; And

The integral body of controlling with lifting drive, described holding device and described swivel bearing portion with lowering or hoisting gear, described squeegee deadweight elimination power with the control of described squeegee pressing force makes the described relatively web plate of the described squeegee squeegee head lifting drive of lifting along the vertical direction.

Adopt this structure, can eliminate the deadweight of squeegee, and can be from making squeegee flexibly along web plate and irrespectively squeegee is pressed into inclination, fluctuating, the case of bending of substrate with end positions of the pivot symmetry of squeegee etc., and, owing to can irrespectively squeegee be held in the posture that do not tilt with the center of gravity of squeegee, so but balance well and balancedly push with constant coining.

In addition, can prevent to be subjected to printing the calendering force of glue when squeegee moves horizontally and make the squeegee knee-action, produce the unbalanced phenomenon of coining, the web plate case of bending that is produced in the time of can leaving getting edition of web plate to substrate further is suppressed to Min..

And in the 3rd screen press, the control of squeegee deadweight elimination power has the deadweight measuring device of automatic instrumentation squeegee deadweight with lifting drive, since by this deadweight measuring device make that the air pressure of adjuster slowly rises, air pressure when the deadweight of described squeegee is eliminated control and will be made described squeegee rising before with the upper limit position of lifting drive is as the instrumentation value of conducting oneself with dignity

Can be to carrying out automatic instrumentation because of the deadweight of the length of squeegee, squeegee that material changes, so operation, setting accuracy and repeatability can make setting printing condition the time improve.

Again in the 3rd screen press,

Be provided with so that squeegee and above the web plate evenly the position during butt as a pair of checkout gear that origin position detects that is pressed into of squeegee, this origin point position detecting unit, after the described squeegee that is risen with lifting drive by the control of squeegee deadweight elimination power is descended, with described squeegee head lifting drive it is slowly descended, described squeegee is that the center enters described web plate evenly with described swivel bearing portion, after this, be subjected to described squeegee being risen from the counter-force of described web plate side, described a pair of squeegee pressing force control with lowering or hoisting gear to arrive from its lower position same rising part apart from the time the position detect, by with the be pressed into origin position of this position as described squeegee

Thereby the balance that can automated manner carry out the relative web plate of squeegee is adjusted operation and the operation that is pressed into the origin position channeling conduct that squeegee is contacted with web plate, and operation, setting accuracy and repeatability raising can make setting printing condition the time.

The invention of the 2nd screen plate printing method, be a kind of be that rotate in vertical guide freely squeegee of pivot contact and is pressed into, moves horizontally with the web plate that forms printing template open pore and the printing offset printing on the described web plate brushed the screen plate printing method that is coated on the substrate by the open pore of described web plate by making assigned positions such as center with length direction, its characteristics are, have:

Each structural element part of comprising described squeegee and moving with described squeegee carried out the automatic instrumentation operation of automatic instrumentation from gravity;

After described automatic instrumentation operation, by the rising operation that described squeegee is risen from gravity behind the described automatic instrumentation;

In described rising operation, become the position of both sides such as symmetric position roughly from the pivot of described relatively squeegee, make described squeegee drop to described web plate or described substrate and be pressed into operation what the pressing force that is applied to the described squeegee on described web plate and the described substrate was pushed with power arbitrarily; And

After being pressed into operation, with described squeegee be subjected to the counter-force of described web plate or described substrate and rise, arrive after setting arbitrarily rising part apart from the time the position detect operation as the origin position that is pressed into of the squeegee that is pressed into origin position of described squeegee.

Because can be to length because of squeegee, material and automatic instrumentation is carried out in the deadweight of the squeegee that changes and the balance that can carry out the relative web plate of squeegee is automatically adjusted operation, so operation in the time of can improving setting printing condition, setting accuracy and repeatability, and can from end positions of the pivot symmetry of squeegee etc. make squeegee flexibly along web plate and with the inclination of substrate, rise and fall, case of bending irrespectively is pressed into squeegee, and, owing to can irrespectively squeegee be held in the posture that do not tilt with the center of gravity of squeegee, so but balance well and balancedly push with constant coining.

The simple declaration of accompanying drawing

Fig. 1 is the summary stereogram of the screen press of the invention process form and the printing head in the screen plate printing method.

Fig. 2 is the summary right view that Fig. 1 prints head.

Fig. 3 is the pneumatics loop diagram that Fig. 1 prints head.

The flow chart that force value is confirmed the action of operation was eliminated in the squeegee deadweight when Fig. 4 was the setting printing condition of presentation graphs 1 printing head.

The stroke initial point that is pressed into of squeegee confirmed that the poised state of operation and the relative web plate of squeegee confirms the flow chart of the action of operation when Fig. 5 was the setting printing condition of presentation graphs 1 printing head.

Fig. 6 is the flow chart of the continuous printing action of presentation graphs 1 printing head.

Fig. 7 (a) reaches (b) the summary right view of expression printing head operating state respectively.

Fig. 8 (a)～(c) represents the summary right view of printing head operating state respectively.

Fig. 9 is the summary front view and the summary pneumatics loop diagram of the low coining printing head in existing screen press and the screen plate printing method.

The optimal morphology that carries out an invention

In Fig. 1, Fig. 2 and Fig. 3, the 21st, have the printing head of constant voltage float-type control device, the 22nd, printing glue, the 23rd, web plate, the 24th, substrate, the 25th, to substrate 24 give positioning and fixing, liftable mounting table below web plate 23.

Printing head 21 usefulness constitutional detail as follows with constant voltage float-type control device constitutes.

26a is a left side printing squeegee, and 26b is a right side printing squeegee, and material constitutes with general urethane rubber.For example, the hardness of urethane rubber is in Hs60～Hs100 scope.

The 27th, as the cylinder of squeegee deadweight elimination power control with lifting drive, the 28th, the piston rod in the cylinder 27, for the top that makes piston rod 28 down, cylinder 27 is installed to descent direction.

The 29th, as the electropneumatic controller of deadweight elimination force control device,, air pressure P is supplied in the cylinder 27 with electropneumatic controller 29 for making piston rod 28 to the ascent direction action.

The 30th, as the bearing of swivel bearing portion, be installed on the top of piston rod 28, and be provided in the center of the length direction of left side printing squeegee 26a, right side printing squeegee 26b.The 31st, rotary body is that bearing 30 rotations supporting is freely leaned at the center with the transverse axis heart.The 32nd, the bearing supporting mass is supported bearing 30.

33a, 33b are the lifting guide shafts, are installed on the bearing supporting mass 32.This lifting is used for bearing radial load when using the air pressure of being supplied with by electropneumatic controller 29 to carry out lifting piston connecting rod 28 with guide shaft 33a, 33b.34a, 34b are sliding bearings, and lifting guide shaft 33a, 33b are installed.

The 35th, control the cylinder of using lifting drive as the squeegee pressing force of front side, the 36th, control the cylinder of using lifting drive as the squeegee pressing force of rear side.Described

cylinder

35,36 is installed in the roughly symmetric position at bearing 30 two ends.

37a, 37b are the piston rods in the

cylinder

35,36, for the top that makes piston rod 37a, 37b down,

cylinder

35,36 is installed to descent direction.

The 39th, as the front side electropneumatic controller of the control device that can control automatically arbitrarily the pressing force that acts on left side squeegee 26a, right side squeegee 26b on web plate 23 and the substrate 24, the 40th, as the rear side electropneumatic controller of the control device that can control automatically arbitrarily the pressing force that acts on left side squeegee 26a, right side squeegee 26b on web plate 23 and basic 24, for piston rod 37a, 37b are moved to descent direction, air pressure is almost supplied in the

cylinder

35,36 simultaneously with electropneumatic controller 39,40.

41a, 41b are pressing bodies, are installed on the top of piston rod 37a, 37b.This pressing body 41a, 41b, when piston rod 28 with piston rod 37a, when 37b is in lifting position, some gaps are arranged with rotary body 31, in case air pressure is supplied in the

cylinder

35,36, just descend with piston rod 37a, 37b.

When because of the decline pressing body 41a of this piston rod 37a, 37b, when 41b pushes rotary body 31, piston rod 28 just descends.

Simultaneously, in case the air pressure that supplies in the

cylinder

35,36 is inequality, the then side's that air pressure is stronger pressing body 41a, 41b generation effect, so that rotary body 31 tilts, being applied to the pressing force (coining) of

squeegee

26a, 26b on web plate 23 and basic 24, can bearing 30 be that symmetry changes arbitrarily.

That is, the air pressure of electropneumatic controller 39 becomes the front side pressing force to left side squeegee 26a, right side squeegee 26b, and the air pressure of electropneumatic controller 40 becomes the rear side pressing force to

squeegee

26a, 26b.

Here, the front side air pressure among the squeegee 26a of left side is made as PF (L); Rear side air pressure in the squeegee of left side is made as PR (L); Front side air pressure among the squeegee 26b of right side is made as PF (R); Rear side air pressure in the squeegee of left side is made as PR (R).

The 42nd, as the cylinder of squeegee switching driving device, 43a is a magnetic valve, by alternately switching the air pressure of the upper limit air scoop and the lower limit air scoop that enter cylinder 42, makes cylinder 42 knee-actions.

44 are mounted in the forked element on cylinder 42 tops, the 45th, swingle, 46a, 46b are rotating shafts, the 47th, and rotary body, the knee-action that utilizes cylinder 42 is that the center makes rotary body 47 do spinning movement by forked element 44, swingle 45 and with rotating shaft 46a, 46b.

48a, 48d, 48c, 48d are the swivel bearing bodies, and 49a, 49b are rotating shafts, and 50a is a left side brackets, and 50b is the right side support, and left side brackets 50a and right side support 50b are separately fixed on rotating shaft 49a and the rotating shaft 49b.

51a is a left side squeegee support, and 51b is a right side squeegee support, will brush 26a, 26b is fixed.Left side brackets 50a, right side support 50b fasten left side squeegee support 51a, right side squeegee support 51b with screw 52a, 52b.

Squeegee

26a, 26b utilize the knee-action of cylinder 42 to replace switching, and magnetic valve 43 is controlled, so that fall left side squeegee 26a when printing to the right from the left side, fall right side squeegee 26b when printing to the left from the right side.

53a, 53b are angle detectors, are fixed on the rear portion of rotating shaft 49a, 49b.Angle adjustment is arranged with handling knob 54 in the front side of rotating shaft 49a, 49b, with handling knob 54, the angle that enters of the relative web plate 23 of left side squeegee 26a, right side squeegee 26b is changed by worm screw 55, turbine 56 rotational angle adjustment.57a, 57b are locks, enter after angle changes making, and are locked.

The air pressure P that will exceed the deadweight part of the constitutional detail class that is suspended under the cylinder 27 by the electropneumatic controller 29 of eliminating force control device with deadweight slightly supplies to as the control of squeegee deadweight elimination power with in the cylinder 27 of lifting drive, then under the state that the deadweight of its constitutional detail class is eliminated, left side squeegee 26a, right side squeegee 26b just rise.And, with the position at detecting sensor 58 its ceilings of detection.

With electropneumatic controller 39,40 air pressure is supplied to and to drive the cylinder 35 of loading amount with lifting and as the cylinder 36 of rear side squeegee pressing force control as the control of front side squeegee pressing force among left side squeegee 26a, the right side squeegee 26b after the rising, thereby left side squeegee 26a, right side squeegee 26b descend with lifting drive.

Under this state, when being pressed into left side squeegee 26a and right side squeegee 26b on the substrate 24 by web plate 23, left side squeegee 26a and right side squeegee 26b can tilt along inclination, fluctuating and the crooked one side of substrate 24 one side and web plate 23 butts.(the front and back pressing force during butt is by the air pressure decision of electropneumatic controller 39,40.)

At this moment, unless described constitutional detail class is the center complete equipilibrium with bearing 30, the position of centre of gravity that is suspended on the constitutional detail class under the cylinder 27 is positioned at a certain position of bearing 30 front and back, and a certain forwards, backwards inclined position, supply with certain air pressure in the higher electropneumatic controller 39,40 in advance, so that the top of left side squeegee 26a, right side squeegee 26b is in level.Here, the compensatory pressure value (the front side compensatory pressure value of left side squeegee) of described air pressure is made as f (L), rear side compensatory pressure value is made as r (L).The front side compensatory pressure value of right side squeegee is made as f (L), and rear side compensatory pressure value is made as r (L).

Therefore, supply to the air pressure of the electropneumatic controller 39,40 in the

cylinder

35,36,, represent with following formula for front side compensatory pressure value f, the rear side compensatory pressure value r total air pressure after adding together.

The total air pressure in front side of left side squeegee is: LF=PF (L)+f (L),

The total air pressure of rear side of left side squeegee is: LR=PR (L)+r (L),

The total air pressure in the front side of right side squeegee is: RF=PF (R)+r (R),

The total air pressure of rear side of left side squeegee is: RR=PR (R)+r (R),

Coining balance before and after the squeegee is by total air pressure LF, LR, RF and RP decision.

When the total air-pressure controlling in the electropneumatic controller 39,40 is become zero, use the deadweight air pressure P partly that is produced with cylinder 27 that left side squeegee 26a, right side squeegee 26b are risen corresponding to the constitutional detail class.

59a, 59b be use with left side squeegee 26a and right side squeegee 26b location remain on the optional position holding device, be that the locking-type cylinder constitutes, and left side squeegee 26a and right side squeegee 26b be by as the control of squeegee deadweight elimination power with the cylinder 27 of lifting drive and as the squeegee pressing force control of front side with the cylinder 35 of lifting drive with use cylinder 36 liftings of lifting drive as the squeegee pressing force control of rear side.

When switching with magnetic valve 43b, 43c when air pressure supplied to each air scoop of locking-

type cylinder

59a, 59b, piston rod 37a, 37b are locked and unlock.

The 60th, as the stepping motor of squeegee head lifting drive, make printing head 21 integral body (comprising as the control of squeegee pressing force) with the

cylinder

35,36 of lowering or hoisting gear, as the cylinder 27 of squeegee deadweight elimination power control lifting drive, as cylinder 59a, the 59b of holding device, as the bearing 30 and the integral body such as left side squeegee 26a, right side squeegee 26b of swivel bearing portion comprise on the left of squeegee 26a, right side squeegee 26b with respect to web plate 23 lifting along the vertical direction.And, from the top of left side squeegee 26a, right side squeegee 26b and the surface that contacts above the web plate 23 downwards be pressed into stroke, position control by the control executor (not shown) of stepping motor 60.

61a, 61b are with left side squeegee 26a, right side squeegee 26b are constituted with the checkout gear that is pressed into origin position, the detecting sensor (noncontacting proximity sensor etc.) of squeegee 26a, the 26b during butt above the web plate 23 evenly.

Detecting

sensor

61a, 61b, to left side squeegee 26a, right side squeegee 26b be subjected to the counter-force of web plate 23 and the position of piston rod after rising slightly in the lower position that make cylinder 35,36 (though the optional position that is installed in the following scope of the above 5mm of 0.1mm is better, but in order to reduce the deflection on squeegee top as far as possible, make it flexibly along inclination, fluctuating and the bending of substrate 24, when the rubber hardness of

squeegee

26a, 26b during, be preferably the following scope of the above 1.5mm of 0.1mm at 90Hs) detect.

The control executor of using with the positioning control in the stepping motor 60 (not shown) makes printing head 21 whole declines, and two sides' detecting sensor 61a, the 61b descending stroke value when detecting is remembered as the origin position that is pressed into of the squeegee of left side squeegee 26a, right side squeegee 26b.

The 62nd, use deadweight checkout gear that the deadweight that is suspended in the constitutional detail class under the cylinder 27 that comprises left side squeegee 26a, right side squeegee 26b is detected automatically, promptly merge with electropneumatic controller 29 that the control that forms constitutes with executor.

Control while the instruction that the air pressure of electropneumatic controller 29 is slowly risen is slowly risen left side squeegee 26a, right side squeegee 26b, when detecting sensor 58 is measured the position at ceiling, stops air pressure with executor 62.

Making the air pressure value P of this moment is that the squeegee deadweight is eliminated force value W by controlling with executor 62 memories as deadweight instrumentation value.

Constitute printing head 21 by the constitutional detail class shown in above with constant voltage float-type control device.

About the as above screen press and the screen plate printing method of structure, its operation principle is described as follows.

As taking industry at first really as, print the squeegee deadweight of head 21 when setting printing condition and eliminate force value affirmation operation.About the effect and the effect of its operation program, generation, describe with reference to operation program block diagram shown in Figure 4.

In step S1a, on support 50a, 50b, left side squeegee 26a, right side squeegee 26b are regulated.

In step S2a, air pressure initial value w1 (w＜1) is supplied to the cylinder 27 from electropneumatic controller 29 by the instruction of control with executor 62.This be for, the air pressure that is no more than the deadweight W that is equivalent to the constitutional detail class by initial air supply pressure shortens the activity duration.

In step S3a, the small value w2 of air pressure is supplied to the cylinder 27 from electropneumatic controller 29 by the instruction of control with executor 62.This is for the instrumentation precision that makes squeegee deadweight the eliminate force value high accuracy more that becomes.Therefore, small value w2 better, is preferably in below the 0.0001MPa below 0.001MPa.In step S4a, rise to upper limit position with the piston rod 28 of 58 pairs of cylinders 27 of detecting sensor and detect affirmation.When detecting to "No", get back to step S3a, N repetition identical operation is up to detecting to till the "Yes".

In step S5a, stop to the small value w2 of cylinder 27 air supply pressure, the air pressure value P (P=w1+w2 * N) feed back to control to remember of this moment with executor 62.The air pressure value P of memory this moment becomes the squeegee deadweight and eliminates force value W (W=P).

In step S6a, remove air pressure P (P=0 (zero)), cylinder 27 is descended.

What more than disclose is operation program from step S1 to step S6, and the squeegee deadweight of printing head when setting printing condition eliminated force value and confirmed that operation need not to rely on skilled thinking work and can carry out automatically.Thus, can operation good, no matter who can both be simply promptly at short notice setting accuracy carry out the squeegee deadweight well, reliably and eliminate force value and confirm operation.

As the 2nd affirmation operation, print the poised state affirmation operation that the stroke initial point is confirmed operation and the relative web plate of squeegee that is pressed into of the squeegee of head 21 when setting printing condition.About the effect and the effect of its operation program, generation, describe with reference to operation program block diagram shown in Figure 5.

This operation program is eliminated force value in the squeegee deadweight and is confirmed must carry out after the end of job.

Carrying out thus at first, squeegee 26b takes industry really as.

In step S1b, printing head 21 is moved horizontally near the center of web plate 23.

In step S2b,, utilize cylinder 42 that right side squeegee 26b is tilted to web plate 23 1 sides in order to switch about squeegee.(carry out the left side squeegee 26a that tilts when left side squeegee 26a takes industry really as.)

In step S3b, instruction by control executor 62 supplies to air pressure W the cylinder 27 from electropneumatic controller 29, the left side squeegee 26a and the right side squeegee 26b that comprise the constitutional detail class that is suspended under the cylinder 27 are risen, the deadweight of squeegee is eliminated.(become Fig. 7 (b) state from Fig. 7 (a).)

In step S4b, for coining balance before and after the squeegee, (air pressure with LF during the squeegee 26a of left side supplies to the front side with total air pressure by electropneumatic controller 39,40, the air pressure of LR supplies to rear side, air pressure with RF during the squeegee 26b of right side supplies to the front side, the air pressure of RR supplies to rear side) supply in the

cylinder

35,36, with right side squeegee 26b under the state of web plate 23 lopsidedness, the integral body of the left side squeegee 26a that comprises the constitutional detail class that is suspended under the cylinder 27 and right side squeegee 26b is descended.Under this state, right side squeegee 26b is in the top not state of contact with web plate 23.(become the state of Fig. 8 (a) from Fig. 7 (b).)

In step S5b, the instruction of the control executor of being used by positioning control (not shown) drives stepping motor 60, makes printing head 21 integral body, and promptly squeegee 26b in right side drops at a high speed near web plate 23 top.Even at this state, right side squeegee 26b also is in the top not state of contact with web plate 23.(becoming the state of Fig. 8 (b) from Fig. 8 (a)).

In step S6b, printing head 21 whole low speed are descended.At this moment, squeegee 26b in right side carries over the top heeling condition of web plate 23 at leisure.

In step S7b, check to squeegee be pressed into the detecting sensor 61a that origin position detects, 61b two sides' detection case, repeating step S6b is till measuring.

In step S8b, after two sides of detecting

sensor

61a, 61b measure, the low speed decline of printing head 21 integral body is stopped.(become the state of Fig. 8 (c).)

In step S9b, descending stroke value when two sides of detecting

sensor

61a, 61b are measured is pressed into origin position (when left side squeegee 26a takes industry really as the squeegee of right side squeegee 26b, squeegee as left side squeegee 26a is pressed into origin position), and it is recorded in the control executor (not shown) that positioning control uses automatically.

In step S10b, printing head 21 is risen overally after (Fig. 7 (b) state), make it be moved horizontally to position of readiness.

Then carry out left side squeegee 26a and take industry really as, to take really that with right side squeegee 26b the same action of industry carries out.

What more than disclose is operation program from step S1b to step S10b, promptly prints the stroke initial point that is pressed into of the squeegee of head when setting printing condition and confirms that the poised state of operation and the relative web plate of squeegee confirms operation.So, confirm that with the stroke initial point that is pressed into that automated manner carries out squeegee the poised state of operation and the relative web plate of squeegee confirms operation by need not to rely on skilled thinking work, can repeatability good, no matter who can both be simply promptly at short notice setting accuracy carry out the squeegee deadweight well, reliably and eliminate force value and confirm operation.

Really after taking that before printing industry finishes as, beginning printing action continuously.About the continuous printing action of this printing head 21, effect and the effect that produces, describe with reference to operation program block diagram shown in Figure 6.

At first, in step S1c, substrate 24 is sent on the mounting table 25, positioned fixing.

In step S2c, make printing head 21 move to printing starting position on the web plate 23.(when printing to the right) than the position in the outside also, the left side of left side squeegee 26a, when printing to the left, than the position in the outside also, the right side of right side squeegee 26b from the right side from the left side

In step S3c, mounting table 25 is risen, above substrate 24, come web plate 23 below near, then, utilize cylinder 42 and right side squeegee 26b dropped to web plate 23 1 sides by switching about squeegee.(when printing to the right from the left side, left side squeegee 26a descends.)

In step S4c, in order to eliminate the deadweight of squeegee, with executor 62 air supply force value W, make rising overally of the left side squeegee 26a that comprises the constitutional detail class and right side squeegee 26b by control.(become the state of Fig. 7 (b) from Fig. 7 (a).)

In step S5c, for coining balance before and after the squeegee, supply with total air pressure value, make the integral body decline of the left side squeegee 26a that comprises the constitutional detail class and right side squeegee 26b.(become the state that is coated with 8 (a) from Fig. 7 (b).)

In step S6c, the rising position of readiness from printing head 21 integral body is pressed into origin position to squeegee, and the stroke that is pressed into the stroke computing that has preestablished input is partly descended.

In step S7c, check printing and the switching that locks printing of floating.During the operation of affirmation in advance before printing, printing or locking printing preestablish, determine to float.

Be moved into the action of step 58c when locking printing, when floating printing, under the original state of the top of the piston rod 37a, the 37b that do not make

cylinder

35,36 locking, be moved into the action of step S9c.

Float and print, be not subjected to inclination, fluctuating and the crooked influence of substrate 24, thereby Yi Bian Yi Bian be suitable for flexibly balancedly printing with constant coining the occasion of (being called the action of

such squeegee

26a, 26b unsteady) along inclination, fluctuating and the bending of substrate 24.

When the printing action, by making

squeegee

26a, 26b become so quick condition, printing glue amount when printing glue 22

usefulness squeegee

26a, 26b be filled in the printing peristome of web plate 23 and stability, the reliability of printing shape are improved, and can make reliably and print glue 22 and be filled on the printing opening template of web plate 23.

The locking printing is applicable to the higher occasion of viscosity of printing glue 22.This occasion, when setting for when floating printing, owing to be low coining, so the printing glue during printing too is subjected to the counter-force of floating,

generation squeegee

26a, 26b easily carry out the tendency of knee-action.Therefore, cause that coining is unbalanced, the printing precision variation.Like this, set the locking printing for, printing glue 22 is filled on the printing opening template of web plate 23 in the higher occasion of printing glue 22 viscosity.In step 58c, during the locking printing, make the top locking of piston rod 37a, the 37b of

cylinder

35,36, thereby be moved into the action of step S9c.

In step S9c, print action.When right side squeegee 26b falls, carry out the printing action from the right side to the left side.(when left side squeegee 26a falls, carry out the printing action from the left side to the right side.)

In step S10c, carrying out after the

printing release squeegee

26a, 26b get version action before, make the top locking of piston rod 37a, the 37b of

cylinder

35,36.

The original state that keeps making its original locking during the locking printing makes its mandatory locking when floating printing.By fixing maintenance of spinning movement, lifting action that makes

squeegee

26a, 26b by this positive lock, produce

squeegee

26a, 26b unnecessary power when suppressing to get edition, can make the original printing shape invariance shape when printing glue 22

usefulness squeegee

26a, 26b be filled in the printing peristome of web plate 23 with respect to web plate 23.

In step S11c, carry out the squeegee rising and get version control.As if it is to rise to the position that the zero-pressure that just will contact with the surface of web plate 23 is gone into by squeegee 26a, 26 top, the amount of deflection of the web plate 23 when suppressing mounting table 25 as far as possible and leaving web plate 23.Thus, can further not make the printing warpage.

In step S12c, carry out mounting table decline and get version control.It is that decrease speed when mounting table is left web plate is set as low speed (less than 1mm/scc), the adhesion strength of the printing peristome side of the web plate 23 when the printing glue 22 that reduces to be filled in the printing peristome of web plate 23 is coated on the substrate 24 with respect to printing, and by reducing the amount of tension of web plate 23 to substrate 24 1 sides, the action of web plate 23 can be suppressed to Min., just can prevent to print warpage.

After getting edition release, in step S13c, mounting table 25 is descended at a high speed after, in step S14c,

squeegee

26a, 26b are risen.Then, in step S15c, remove the positioning and fixing of substrate 24, send substrate 24.

Repeat the printing action of above-mentioned step S1c to step S15c, printing just continues continuously.

Claims

1. a screen press has: the web plate that forms printing template open pore; With the assigned position of length direction is that pivot is made the squeegee freely, that contact freely and can be pressed into described web plate of rotary oscillation up and down; And the horizontally moving device that described squeegee is moved along general horizontal direction relative to described web plate,

Making described squeegee contact and be pressed into, move horizontally and the printing offset printing on the described web plate being brushed in the screen press that is coated on the substrate by the open pore of described web plate with described web plate, it is characterized in that,

Has constant voltage float-type control device, when it prints coating and printing glue on described web plate, from applying power to ascent direction and make state after squeegee rises for eliminating described squeegee deadweight, to be applied to described squeegee to the power that descent direction presses down by the position that becomes both sides from described pivot along its length makes described squeegee contact and be pressed into freely with described web plate, and, when make described squeegee relative to described web plate when general horizontal direction moves, with along described substrate with respect to the approximate horizontal moving direction of described squeegee and the inclination of length direction, states such as fluctuating and bending are made the posture of rotary oscillation and lifting, with described squeegee described web plate is pressed into to described substrate, produces constant voltage simultaneously.

2. screen plate printing method, be a kind of be that rotate in vertical guide freely squeegee of pivot contact and is pressed into, moves horizontally with the web plate that forms printing template open pore and the printing offset printing on the described web plate brushed the screen plate printing method that is coated on the substrate by the open pore of described web plate by making assigned position with length direction, it is characterized in that

3. screen press as claimed in claim 1 is characterized in that having:

Make described squeegee be pressed into freely press-in device; And